In the res?! got ant links about it.
Link doesn't work but here is the bottom line
Results
It has been more than two
years since the ozone
system was installed and it
continues to deliver positive
results.
Figure 2 shows the very clear
difference between the
original raw water and the
post-treatment water.
Hydrogen sulfide was
eliminated completely – from
60 ppm to zero ppm.
The ozone system was able
to dramatically reduce the
organic load in the water,
which had a direct
influence on the water’s
pH (lowered from 7.8 to 7.04) and ORP ( raised
from –177 mV to a +225
mV).
The significant changes to
the overall water quality
paved the way for vast
improvements in crop
production results.
Rejection rates of 40
percent were reduced to
less than 3 percent and
fertilizer costs have been
cut by at least 50 percent.
The interval from planting
to first harvest was
shortened by 28 days,
contributing to an
impressive increase in
total yield of more than
300 percent.
With improved yields and
reduced operating costs,
the grower’s return on
ozone system investment
was just six months.
"From the September 2002 edition of Water Technology magazine"